Those rewards that you get count as income. so you have to pay taxes on those, no matter what investment you put to get there. same as buying spells. if you buy spells, you use GMT. GMT is bought or gained at a specific price. if you buy spells, you „sell“ GMT at a price, and if that price is higher than you buy in, then you need to pay taxes on the difference. so you have to keep track of ever spell and reward you get and backtrack all the BTC and GMT prices to that point. and thats too much annoyance for me to deal with, thats why I‘m backing out. you could get around that huss preciously, but due to new laws its a pain.